This Bitwig Studio tutorial from the official Bitwig channel demonstrates how to use Stretch expressions in the Detail Editor Panel to go beyond basic audio event stretching. Rather than simply dragging the edge of a clip, Stretch expressions let you place beat markers as anchors at specific points along the audio event, so you can stretch only the sections that need it while leaving everything before a given marker completely undisturbed.
The key idea is surgical control: anchor a beat marker at measure two, for instance, and anything before that point stays locked in place while the rest conforms to your grid. This makes it practical for nudging audio that nearly lines up with your beat and groove into perfect alignment without affecting the parts that are already sitting right.